compute: Allow setting both ssl_certificates and certificate_map (#6770) (#12950)

Signed-off-by: Modular Magician <[email protected]>

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/6770.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+compute: made `target_https_proxy` possible to set `ssl_certificates` and `certificate_map` at the same time
+```

google/resource_compute_target_https_proxy.go

@@ -66,7 +66,6 @@ to the BackendService.`,
 				Description: `A reference to the CertificateMap resource uri that identifies a certificate map 
 associated with the given target proxy. This field can only be set for global target proxies.
 Accepted format is '//certificatemanager.googleapis.com/projects/{project}/locations/{location}/certificateMaps/{resourceName}'.`,
-				ExactlyOneOf: []string{"ssl_certificates", "certificate_map"},
 			},
 			"description": {
 				Type:        schema.TypeString,
@@ -103,7 +102,6 @@ certificate must be specified.`,
 					Type:             schema.TypeString,
 					DiffSuppressFunc: compareSelfLinkOrResourceName,
 				},
-				ExactlyOneOf: []string{"ssl_certificates", "certificate_map"},
 			},
 			"ssl_policy": {
 				Type:             schema.TypeString,